I can imagine some ways to do it, but they are too complex to follow manually. I can only suggest to try and retry until you get the right balance.

Thanks Wacov- I forgot that the simulation can be undone.
To •BTM: My poor english sometimes makes my sentences unclear- specially when I'm in hurry.

A stupid suggestion... The cars'objects could be locked to make easier to cancel the previous track until automatic reset is available.

Suggestions:

1. make the follow object as little as you can.
2. download the latest version of SP(27 june) wich support individual object density and set the object's to 0. DO that if you want only to try- you can't upload models made with this version.
3. create a line between the object's and the rocket's COGs. Then create another object identical to the 'follow' one (without the same name) and put it on the line. The COG of the new object must be at the same distance of the follow's, but at the other side in comparison to the rocket. Then link the new object to the same servo of the Follow. This should balance the model.

If you need square root, this is my suggestion:
x**0.5

I hate to seach and rewrite code. I am very intrested in this. thanks in advance

@wacov said:

With the teleportation, will the camera be moved if it's following a teleported object? And could you have a breakable object, which, when broken, teleports back to the starting position with all its joints intact?

To fix the camera problems I think the best would be a "camera" joint. I know that In other 3D programs they are commonly used. It would be more user-frendly,too.
This is what I mean:

It's possible to set the joints' variables with connectTo?
Ad also, this innovations will need a lot of documentations.

I think BTM intended a screenshot of a SP simulation...
-It's possible to make an icon which will be showed on the browser's tab. Is a 16x16 pixels icon, and if there isn't something better I will use the main image and resize it.
-About images... I think that some pictures can improve our wiki. But unfortunately I can't upload images for something like a bug, so it's up to you.

I could make the first link (http://sketchyphysics.wikia.com) work. It means that we have a complete wiki for SP. So, add the new pages here. I am transferring the old pages to the new wiki. I am sorry if I made some trouble, but is better do it now than in the future.
P.S. In the new wiki we can show a SP LOGO. I don't know if there is already one. If not, is a good chance to start creating one.